[rollei_list] Re: OT: Digital Projection
- From: Eric Goldstein <egoldste@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 21 Jul 2010 10:34:40 -0400
John -
I've worked in stereo for over 30 years and knows most of the folks
who contribute content on the website you reference. Your explanation
is not correct. Both those "rules" are not rules at all and can be
broken comfortably in still and motion stereo imaging. It is done all the time
and you can find examples which are widely distributed/published which
most folks are happy to view.
The likely cause of the discomfort you experience is your eye's
inability to accommodate to the amount of divergence between the left
and right image pairs the film-makers are offering you. Accommodation
is highly individual and some folks can handle more than others. This
is a well-documented problem with 3D imaging... some people simply
cannot tolerate much of it and it strains their eyes and gives them a
headache.
As for Elias' screening appearing out of focus... it could in fact
have been out of focus but we would need to know more before we could
say so reliably.
BTW do you have a roll film adapter for the Heidoscop?
Eric Goldstein
--
On Wed, Jul 21, 2010 at 10:15 AM, John Wild
<JWild@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Elias,
>
> I watched 'Avatar' in 3D and had to take my 3D glasses off in the early
> scenes; later on I could put them back on again for a short time but then
> had to take them off and on again. I started to feel 'sea sick' and my eyes
> were starting to ache. A number of people also say this. As you say, it
> 'appears' out of focus...
>
> Having played with my Heidoscope and 3D, I had researched the theories
> behind 3D and when looking at the movie, two golden rules are broken which
> cause the effect:
>
> i) the scene should be sharp from front to back. This did not happen with
> Avatar because the director/cameraman wants you to focus on the 'talking'
> actor (as in 2D) and so focus flits about and a large part of the screen is
> blurred. Your brain cannot cope with correlating 3D and out of focus because
> as your eyes flit about a 'live' scene, they automatically bring the centre
> of vision into focus and do not 'see' the surrounding areas.
>
> ii) subject elements should remain within the stereo 'window'. It is OK for
> a branch to come 'forward' through the window if it starts within the
> window. It is not acceptable for this branch to appear in front of the
> window if it appears to be coming through the area outside the window - this
> can be caused by incorrectly spacing the two images. In Avatar, the tree
> branches and the 'dust particles' appeared to be floating over the audience
> and it seemed 'wrong' because some were outside the window. When the camera
> flits about quickly, your senses cannot cope. I guess that the computer
> operators over exaggerated the effect for the 'wow' factor; a bit like over
> saturating a photograph to get the 'wow,' but it looks 'wrong' if over done.
>
> See - http://www.stereoscopy.com/library/waack-rules.html
>
> John
>
>
> On 21/07/2010 01:47, "Elias_Roustom" <elroustom@xxxxxxxxx> wrote:
>
>> I watched Toy Story 3D today with my family, and it was great fun to
>> see 3D animation.
>> The whole picture was as far as I could make out, out of focus. I told
>> the manager on my way out and she denied it (bitterly I might add).
>> "It's all digital, there's no way it was out of focus." Hah. Brave
>> new world.
>> ---
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